Methods and systems for utilizing waste sources of metal oxides
First Claim
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1. A method comprising:
- a) contacting an aqueous solution with a source of metal oxides from a first industrial process;
b) charging the aqueous solution with carbon dioxide from a source of carbon dioxide from the same or a second industrial process, wherein the source of carbon dioxide further comprises SOx, NOx, mercury, or any combination thereof; and
c) subjecting the aqueous solution to precipitation conditions under atmospheric pressure to produce at least one carbonate-containing precipitation material, wherein the precipitation material comprises calcium carbonate, optionally in combination with magnesium carbonate, wherein the calcium carbonate comprises a precipitation material selected from the group consisting of aragonite, vaterite, and mixtures thereof.
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Abstract
Methods are provided for producing a composition comprising carbonates, wherein the methods comprise utilizing waste sources of metal oxides. An aqueous solution of divalent cations, some or all of which are derived from a waste source of metal oxides, may be contacted with CO2 and subjected to precipitation conditions to provide compositions comprising carbonates. In some embodiments, a combustion ash is the waste source of metal oxides for the aqueous solution containing divalent cations. In some embodiments, a combustion ash is used to provide a source of proton-removing agents, divalent cations, silica, metal oxides, or other desired constituents or a combination thereof.
305 Citations
11 Claims
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1. A method comprising:
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a) contacting an aqueous solution with a source of metal oxides from a first industrial process; b) charging the aqueous solution with carbon dioxide from a source of carbon dioxide from the same or a second industrial process, wherein the source of carbon dioxide further comprises SOx, NOx, mercury, or any combination thereof; and c) subjecting the aqueous solution to precipitation conditions under atmospheric pressure to produce at least one carbonate-containing precipitation material, wherein the precipitation material comprises calcium carbonate, optionally in combination with magnesium carbonate, wherein the calcium carbonate comprises a precipitation material selected from the group consisting of aragonite, vaterite, and mixtures thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification